1 #!/usr/bin/perl -w
2 #
3 # CDDL HEADER START
4 #
5 # The contents of this file are subject to the terms of the
6 # Common Development and Distribution License (the "License").
7 # You may not use this file except in compliance with the License.
8 #
9 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 # or http://www.opensolaris.org/os/licensing.
11 # See the License for the specific language governing permissions
12 # and limitations under the License.
13 #
14 # When distributing Covered Code, include this CDDL HEADER in each
15 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 # If applicable, add the following below this CDDL HEADER, with the
17 # fields enclosed by brackets "[]" replaced with your own identifying
18 # information: Portions Copyright [yyyy] [name of copyright owner]
19 #
20 # CDDL HEADER END
21 #
22 # Copyright 2015 Toomas Soome <tsoome@me.com>
23 # Copyright 2016 Nexenta Systems, Inc.
24 # Copyright 2020 Oxide Computer Company
25 #
26 # Copyright 2008 Sun Microsystems, Inc. All rights reserved.
27 # Use is subject to license terms.
28 #
29 # Copyright (c) 2015 by Delphix. All rights reserved.
30 #
31 # @(#)cstyle 1.58 98/09/09 (from shannon)
32 #
33 # cstyle - check for some common stylistic errors.
34 #
35 # cstyle is a sort of "lint" for C coding style.
36 # It attempts to check for the style used in the
37 # kernel, sometimes known as "Bill Joy Normal Form".
38 #
39 # There's a lot this can't check for, like proper indentation
40 # of code blocks. There's also a lot more this could check for.
41 #
42 # A note to the non perl literate:
43 #
44 # perl regular expressions are pretty much like egrep
45 # regular expressions, with the following special symbols
46 #
47 # \s any space character
48 # \S any non-space character
49 # \w any "word" character [a-zA-Z0-9_]
50 # \W any non-word character
51 # \d a digit [0-9]
52 # \D a non-digit
53 # \b word boundary (between \w and \W)
54 # \B non-word boundary
55 #
56
57 require 5.0;
58 use IO::File;
59 use Getopt::Std;
60 use strict;
61
62 my $usage =
63 "usage: cstyle [-chpvCP] [-o constructs] file ...
64 -c check continuation indentation inside functions
65 -h perform heuristic checks that are sometimes wrong
66 -p perform some of the more picky checks
67 -v verbose
68 -C don't check anything in header block comments
69 -P check for use of non-POSIX types
70 -o constructs
71 allow a comma-seperated list of optional constructs:
72 doxygen allow doxygen-style block comments (/** /*!)
73 splint allow splint-style lint comments (/*@ ... @*/)
74 ";
75
76 my %opts;
77
78 if (!getopts("cho:pvCP", \%opts)) {
79 print $usage;
80 exit 2;
81 }
82
83 my $check_continuation = $opts{'c'};
84 my $heuristic = $opts{'h'};
85 my $picky = $opts{'p'};
86 my $verbose = $opts{'v'};
87 my $ignore_hdr_comment = $opts{'C'};
88 my $check_posix_types = $opts{'P'};
89
90 my $doxygen_comments = 0;
91 my $splint_comments = 0;
92
93 if (defined($opts{'o'})) {
94 for my $x (split /,/, $opts{'o'}) {
95 if ($x eq "doxygen") {
96 $doxygen_comments = 1;
97 } elsif ($x eq "splint") {
98 $splint_comments = 1;
99 } else {
100 print "cstyle: unrecognized construct \"$x\"\n";
101 print $usage;
102 exit 2;
103 }
104 }
105 }
106
107 my ($filename, $line, $prev); # shared globals
108
109 my $fmt;
110 my $hdr_comment_start;
111
112 if ($verbose) {
113 $fmt = "%s: %d: %s\n%s\n";
114 } else {
115 $fmt = "%s: %d: %s\n";
116 }
117
118 if ($doxygen_comments) {
119 # doxygen comments look like "/*!" or "/**"; allow them.
120 $hdr_comment_start = qr/^\s*\/\*[\!\*]?$/;
121 } else {
122 $hdr_comment_start = qr/^\s*\/\*$/;
123 }
124
125 # FreeBSD uses comments styled as such for their license headers:
126 # /*-
127 # * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
128 # *
129 # ...
130 #
131 # In order to apply other cstyle checks to those files without stumbling over
132 # the license header, tolerate such comment openings as well.
133 my $fbsd_comment_start = qr/^\s*\/\*-$/;
134
135 # Note, following must be in single quotes so that \s and \w work right.
136 my $typename = '(int|char|short|long|unsigned|float|double' .
137 '|\w+_t|struct\s+\w+|union\s+\w+|FILE)';
138
139 # mapping of old types to POSIX compatible types
140 my %old2posix = (
141 'unchar' => 'uchar_t',
142 'ushort' => 'ushort_t',
143 'uint' => 'uint_t',
144 'ulong' => 'ulong_t',
145 'u_int' => 'uint_t',
146 'u_short' => 'ushort_t',
147 'u_long' => 'ulong_t',
148 'u_char' => 'uchar_t',
149 'u_int8_t' => 'uint8_t',
150 'u_int16_t' => 'uint16_t',
151 'u_int32_t' => 'uint32_t',
152 'u_int64_t' => 'uint64_t',
153 'u_quad_t' => 'uint64_t',
154 'quad' => 'quad_t'
155 );
156
157 my $lint_re = qr/\/\*(?:
158 ARGSUSED[0-9]*|NOTREACHED|LINTLIBRARY|VARARGS[0-9]*|
159 CONSTCOND|CONSTANTCOND|CONSTANTCONDITION|EMPTY|
160 FALLTHRU|FALLTHROUGH|LINTED.*?|PRINTFLIKE[0-9]*|
161 PROTOLIB[0-9]*|SCANFLIKE[0-9]*|CSTYLED.*?
162 )\*\//x;
163
164 my $splint_re = qr/\/\*@.*?@\*\//x;
165
166 my $warlock_re = qr/\/\*\s*(?:
167 VARIABLES\ PROTECTED\ BY|
168 MEMBERS\ PROTECTED\ BY|
169 ALL\ MEMBERS\ PROTECTED\ BY|
170 READ-ONLY\ VARIABLES:|
171 READ-ONLY\ MEMBERS:|
172 VARIABLES\ READABLE\ WITHOUT\ LOCK:|
173 MEMBERS\ READABLE\ WITHOUT\ LOCK:|
174 LOCKS\ COVERED\ BY|
175 LOCK\ UNNEEDED\ BECAUSE|
176 LOCK\ NEEDED:|
177 LOCK\ HELD\ ON\ ENTRY:|
178 READ\ LOCK\ HELD\ ON\ ENTRY:|
179 WRITE\ LOCK\ HELD\ ON\ ENTRY:|
180 LOCK\ ACQUIRED\ AS\ SIDE\ EFFECT:|
181 READ\ LOCK\ ACQUIRED\ AS\ SIDE\ EFFECT:|
182 WRITE\ LOCK\ ACQUIRED\ AS\ SIDE\ EFFECT:|
183 LOCK\ RELEASED\ AS\ SIDE\ EFFECT:|
184 LOCK\ UPGRADED\ AS\ SIDE\ EFFECT:|
185 LOCK\ DOWNGRADED\ AS\ SIDE\ EFFECT:|
186 FUNCTIONS\ CALLED\ THROUGH\ POINTER|
187 FUNCTIONS\ CALLED\ THROUGH\ MEMBER|
188 LOCK\ ORDER:
189 )/x;
190
191 my $err_stat = 0; # exit status
192
193 if ($#ARGV >= 0) {
194 foreach my $arg (@ARGV) {
195 my $fh = new IO::File $arg, "r";
196 if (!defined($fh)) {
197 printf "%s: can not open\n", $arg;
198 } else {
199 &cstyle($arg, $fh);
200 close $fh;
201 }
202 }
203 } else {
204 &cstyle("<stdin>", *STDIN);
205 }
206 exit $err_stat;
207
208 my $no_errs = 0; # set for CSTYLED-protected lines
209
210 sub err($) {
211 my ($error) = @_;
212 unless ($no_errs) {
213 if ($verbose) {
214 printf $fmt, $filename, $., $error, $line;
215 } else {
216 printf $fmt, $filename, $., $error;
217 }
218 $err_stat = 1;
219 }
220 }
221
222 sub err_prefix($$) {
223 my ($prevline, $error) = @_;
224 my $out = $prevline."\n".$line;
225 unless ($no_errs) {
226 if ($verbose) {
227 printf $fmt, $filename, $., $error, $out;
228 } else {
229 printf $fmt, $filename, $., $error;
230 }
231 $err_stat = 1;
232 }
233 }
234
235 sub err_prev($) {
236 my ($error) = @_;
237 unless ($no_errs) {
238 if ($verbose) {
239 printf $fmt, $filename, $. - 1, $error, $prev;
240 } else {
241 printf $fmt, $filename, $. - 1, $error;
242 }
243 $err_stat = 1;
244 }
245 }
246
247 sub cstyle($$) {
248
249 my ($fn, $filehandle) = @_;
250 $filename = $fn; # share it globally
251
252 my $in_cpp = 0;
253 my $next_in_cpp = 0;
254
255 my $in_comment = 0;
256 my $in_header_comment = 0;
257 my $comment_done = 0;
258 my $in_warlock_comment = 0;
259 my $in_function = 0;
260 my $in_function_header = 0;
261 my $function_header_full_indent = 0;
262 my $in_declaration = 0;
263 my $note_level = 0;
264 my $nextok = 0;
265 my $nocheck = 0;
266
267 my $in_string = 0;
268
269 my ($okmsg, $comment_prefix);
270
271 $line = '';
272 $prev = '';
273 reset_indent();
274
275 line: while (<$filehandle>) {
276 s/\r?\n$//; # strip return and newline
277
278 # save the original line, then remove all text from within
279 # double or single quotes, we do not want to check such text.
280
281 $line = $_;
282
283 #
284 # C allows strings to be continued with a backslash at the end of
285 # the line. We translate that into a quoted string on the previous
286 # line followed by an initial quote on the next line.
287 #
288 # (we assume that no-one will use backslash-continuation with character
289 # constants)
290 #
291 $_ = '"' . $_ if ($in_string && !$nocheck && !$in_comment);
292
293 #
294 # normal strings and characters
295 #
296 s/'([^\\']|\\[^xX0]|\\0[0-9]*|\\[xX][0-9a-fA-F]*)'/''/g;
297 s/"([^\\"]|\\.)*"/\"\"/g;
298
299 #
300 # detect string continuation
301 #
302 if ($nocheck || $in_comment) {
303 $in_string = 0;
304 } else {
305 #
306 # Now that all full strings are replaced with "", we check
307 # for unfinished strings continuing onto the next line.
308 #
309 $in_string =
310 (s/([^"](?:"")*)"([^\\"]|\\.)*\\$/$1""/ ||
311 s/^("")*"([^\\"]|\\.)*\\$/""/);
312 }
313
314 #
315 # figure out if we are in a cpp directive
316 #
317 $in_cpp = $next_in_cpp || /^\s*#/; # continued or started
318 $next_in_cpp = $in_cpp && /\\$/; # only if continued
319
320 # strip off trailing backslashes, which appear in long macros
321 s/\s*\\$//;
322
323 # an /* END CSTYLED */ comment ends a no-check block.
324 if ($nocheck) {
325 if (/\/\* *END *CSTYLED *\*\//) {
326 $nocheck = 0;
327 } else {
328 reset_indent();
329 next line;
330 }
331 }
332
333 # a /*CSTYLED*/ comment indicates that the next line is ok.
334 if ($nextok) {
335 if ($okmsg) {
336 err($okmsg);
337 }
338 $nextok = 0;
339 $okmsg = 0;
340 if (/\/\* *CSTYLED.*\*\//) {
341 /^.*\/\* *CSTYLED *(.*) *\*\/.*$/;
342 $okmsg = $1;
343 $nextok = 1;
344 }
345 $no_errs = 1;
346 } elsif ($no_errs) {
347 $no_errs = 0;
348 }
349
350 # check length of line.
351 # first, a quick check to see if there is any chance of being too long.
352 if (($line =~ tr/\t/\t/) * 7 + length($line) > 80) {
353 # yes, there is a chance.
354 # replace tabs with spaces and check again.
355 my $eline = $line;
356 1 while $eline =~
357 s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e;
358 if (length($eline) > 80) {
359 err("line > 80 characters");
360 }
361 }
362
363 # ignore NOTE(...) annotations (assumes NOTE is on lines by itself).
364 if ($note_level || /\b_?NOTE\s*\(/) { # if in NOTE or this is NOTE
365 s/[^()]//g; # eliminate all non-parens
366 $note_level += s/\(//g - length; # update paren nest level
367 next;
368 }
369
370 # a /* BEGIN CSTYLED */ comment starts a no-check block.
371 if (/\/\* *BEGIN *CSTYLED *\*\//) {
372 $nocheck = 1;
373 }
374
375 # a /*CSTYLED*/ comment indicates that the next line is ok.
376 if (/\/\* *CSTYLED.*\*\//) {
377 /^.*\/\* *CSTYLED *(.*) *\*\/.*$/;
378 $okmsg = $1;
379 $nextok = 1;
380 }
381 if (/\/\/ *CSTYLED/) {
382 /^.*\/\/ *CSTYLED *(.*)$/;
383 $okmsg = $1;
384 $nextok = 1;
385 }
386
387 # universal checks; apply to everything
388 if (/\t +\t/) {
389 err("spaces between tabs");
390 }
391 if (/ \t+ /) {
392 err("tabs between spaces");
393 }
394 if (/\s$/) {
395 err("space or tab at end of line");
396 }
397 if (/[^ \t(]\/\*/ && !/\w\(\/\*.*\*\/\);/) {
398 err("comment preceded by non-blank");
399 }
400
401 # is this the beginning or ending of a function?
402 # (not if "struct foo\n{\n")
403 if (/^\{$/ && $prev =~ /\)\s*(const\s*)?(\/\*.*\*\/\s*)?\\?$/) {
404 $in_function = 1;
405 $in_declaration = 1;
406 $in_function_header = 0;
407 $function_header_full_indent = 0;
408 $prev = $line;
409 next line;
410 }
411 if (/^\}\s*(\/\*.*\*\/\s*)*$/) {
412 if ($prev =~ /^\s*return\s*;/) {
413 err_prev("unneeded return at end of function");
414 }
415 $in_function = 0;
416 reset_indent(); # we don't check between functions
417 $prev = $line;
418 next line;
419 }
420 if ($in_function_header && ! /^ (\w|\.)/ ) {
421 if (/^\{\}$/) {
422 $in_function_header = 0;
423 $function_header_full_indent = 0;
424 } elsif ($picky && ! (/^\t/ && $function_header_full_indent != 0)) {
425 err("continuation line should be indented by 4 spaces");
426 }
427 }
428
429 #
430 # If this matches something of form "foo(", it's probably a function
431 # definition, unless it ends with ") bar;", in which case it's a declaration
432 # that uses a macro to generate the type.
433 #
434 if (/^\w+\(/ && !/\) \w+;$/) {
435 $in_function_header = 1;
436 if (/\($/) {
437 $function_header_full_indent = 1;
438 }
439 }
440 if ($in_function_header && /^\{$/) {
441 $in_function_header = 0;
442 $function_header_full_indent = 0;
443 $in_function = 1;
444 }
445 if ($in_function_header && /\);$/) {
446 $in_function_header = 0;
447 $function_header_full_indent = 0;
448 }
449 if ($in_function_header && /\{$/ ) {
450 if ($picky) {
451 err("opening brace on same line as function header");
452 }
453 $in_function_header = 0;
454 $function_header_full_indent = 0;
455 $in_function = 1;
456 next line;
457 }
458
459 if ($in_warlock_comment && /\*\//) {
460 $in_warlock_comment = 0;
461 $prev = $line;
462 next line;
463 }
464
465 # a blank line terminates the declarations within a function.
466 # XXX - but still a problem in sub-blocks.
467 if ($in_declaration && /^$/) {
468 $in_declaration = 0;
469 }
470
471 if ($comment_done) {
472 $in_comment = 0;
473 $in_header_comment = 0;
474 $comment_done = 0;
475 }
476 # does this looks like the start of a block comment?
477 if (/$hdr_comment_start/ || /$fbsd_comment_start/) {
478 if (!/^\t*\/\*/) {
479 err("block comment not indented by tabs");
480 }
481 $in_comment = 1;
482 /^(\s*)\//;
483 $comment_prefix = $1;
484 if ($comment_prefix eq "") {
485 $in_header_comment = 1;
486 }
487 $prev = $line;
488 next line;
489 }
490 # are we still in the block comment?
491 if ($in_comment) {
492 if (/^$comment_prefix \*\/$/) {
493 $comment_done = 1;
494 } elsif (/\*\//) {
495 $comment_done = 1;
496 err("improper block comment close")
497 unless ($ignore_hdr_comment && $in_header_comment);
498 } elsif (!/^$comment_prefix \*[ \t]/ &&
499 !/^$comment_prefix \*$/) {
500 err("improper block comment")
501 unless ($ignore_hdr_comment && $in_header_comment);
502 }
503 }
504
505 if ($in_header_comment && $ignore_hdr_comment) {
506 $prev = $line;
507 next line;
508 }
509
510 # check for errors that might occur in comments and in code.
511
512 # allow spaces to be used to draw pictures in header comments.
513 if (/[^ ] / && !/".* .*"/ && !$in_header_comment) {
514 err("spaces instead of tabs");
515 }
516 if (/^ / && !/^ \*[ \t\/]/ && !/^ \*$/ &&
517 (!/^ (\w|\.)/ || $in_function != 0)) {
518 err("indent by spaces instead of tabs");
519 }
520 if (/^\t+ [^ \t\*]/ || /^\t+ \S/ || /^\t+ \S/) {
521 err("continuation line not indented by 4 spaces");
522 }
523 if (/$warlock_re/ && !/\*\//) {
524 $in_warlock_comment = 1;
525 $prev = $line;
526 next line;
527 }
528 if (/^\s*\/\*./ && !/^\s*\/\*.*\*\// && !/$hdr_comment_start/) {
529 err("improper first line of block comment");
530 }
531
532 if ($in_comment) { # still in comment, don't do further checks
533 $prev = $line;
534 next line;
535 }
536
537 if ((/[^(]\/\*\S/ || /^\/\*\S/) &&
538 !(/$lint_re/ || ($splint_comments && /$splint_re/))) {
539 err("missing blank after open comment");
540 }
541 if (/\S\*\/[^)]|\S\*\/$/ &&
542 !(/$lint_re/ || ($splint_comments && /$splint_re/))) {
543 err("missing blank before close comment");
544 }
545 if (/\/\/\S/) { # C++ comments
546 err("missing blank after start comment");
547 }
548 # check for unterminated single line comments, but allow them when
549 # they are used to comment out the argument list of a function
550 # declaration.
551 if (/\S.*\/\*/ && !/\S.*\/\*.*\*\// && !/\(\/\*/) {
552 err("unterminated single line comment");
553 }
554
555 if (/^(#else|#endif|#include)(.*)$/) {
556 $prev = $line;
557 if ($picky) {
558 my $directive = $1;
559 my $clause = $2;
560 # Enforce ANSI rules for #else and #endif: no noncomment
561 # identifiers are allowed after #endif or #else. Allow
562 # C++ comments since they seem to be a fact of life.
563 if ((($1 eq "#endif") || ($1 eq "#else")) &&
564 ($clause ne "") &&
565 (!($clause =~ /^\s+\/\*.*\*\/$/)) &&
566 (!($clause =~ /^\s+\/\/.*$/))) {
567 err("non-comment text following " .
568 "$directive (or malformed $directive " .
569 "directive)");
570 }
571 }
572 next line;
573 }
574
575 #
576 # delete any comments and check everything else. Note that
577 # ".*?" is a non-greedy match, so that we don't get confused by
578 # multiple comments on the same line.
579 #
580 s/\/\*.*?\*\///g;
581 s/\/\/.*$//; # C++ comments
582
583 # delete any trailing whitespace; we have already checked for that.
584 s/\s*$//;
585
586 # following checks do not apply to text in comments.
587
588 if (/[^<>\s][!<>=]=/ || /[^<>][!<>=]=[^\s,]/ ||
589 (/[^->]>[^,=>\s]/ && !/[^->]>$/) ||
590 (/[^<]<[^,=<\s]/ && !/[^<]<$/) ||
591 /[^<\s]<[^<]/ || /[^->\s]>[^>]/) {
592 err("missing space around relational operator");
593 }
594 if (/\S>>=/ || /\S<<=/ || />>=\S/ || /<<=\S/ || /\S[-+*\/&|^%]=/ ||
595 (/[^-+*\/&|^%!<>=\s]=[^=]/ && !/[^-+*\/&|^%!<>=\s]=$/) ||
596 (/[^!<>=]=[^=\s]/ && !/[^!<>=]=$/)) {
597 # XXX - should only check this for C++ code
598 # XXX - there are probably other forms that should be allowed
599 if (!/\soperator=/) {
600 err("missing space around assignment operator");
601 }
602 }
603 if (/[,;]\S/ && !/\bfor \(;;\)/) {
604 err("comma or semicolon followed by non-blank");
605 }
606 # allow "for" statements to have empty "while" clauses
607 if (/\s[,;]/ && !/^[\t]+;$/ && !/^\s*for \([^;]*; ;[^;]*\)/) {
608 err("comma or semicolon preceded by blank");
609 }
610 if (/^\s*(&&|\|\|)/) {
611 err("improper boolean continuation");
612 }
613 if (/\S *(&&|\|\|)/ || /(&&|\|\|) *\S/) {
614 err("more than one space around boolean operator");
615 }
616 if (/\b(for|if|while|switch|sizeof|return|case)\(/) {
617 err("missing space between keyword and paren");
618 }
619 if (/(\b(for|if|while|switch|return)\b.*){2,}/ && !/^#define/) {
620 # multiple "case" and "sizeof" allowed
621 err("more than one keyword on line");
622 }
623 if (/\b(for|if|while|switch|sizeof|return|case)\s\s+\(/ &&
624 !/^#if\s+\(/) {
625 err("extra space between keyword and paren");
626 }
627 # try to detect "func (x)" but not "if (x)" or
628 # "#define foo (x)" or "int (*func)();"
629 if (/\w\s\(/) {
630 my $s = $_;
631 # strip off all keywords on the line
632 s/\b(for|if|while|switch|return|case|sizeof)\s\(/XXX(/g;
633 s/#elif\s\(/XXX(/g;
634 s/^#define\s+\w+\s+\(/XXX(/;
635 # do not match things like "void (*f)();"
636 # or "typedef void (func_t)();"
637 s/\w\s\(+\*/XXX(*/g;
638 s/\b($typename|void)\s+\(+/XXX(/og;
639 if (/\w\s\(/) {
640 err("extra space between function name and left paren");
641 }
642 $_ = $s;
643 }
644 # try to detect "int foo(x)", but not "extern int foo(x);"
645 # XXX - this still trips over too many legitimate things,
646 # like "int foo(x,\n\ty);"
647 # if (/^(\w+(\s|\*)+)+\w+\(/ && !/\)[;,](\s|)*$/ &&
648 # !/^(extern|static)\b/) {
649 # err("return type of function not on separate line");
650 # }
651 # this is a close approximation
652 if (/^(\w+(\s|\*)+)+\w+\(.*\)(\s|)*$/ &&
653 !/^(extern|static)\b/) {
654 err("return type of function not on separate line");
655 }
656 if (/^#define /) {
657 err("#define followed by space instead of tab");
658 }
659 if (/^\s*return\W[^;]*;/ && !/^\s*return\s*\(.*\);/) {
660 err("unparenthesized return expression");
661 }
662 if (/\bsizeof\b/ && !/\bsizeof\s*\(.*\)/) {
663 err("unparenthesized sizeof expression");
664 }
665 if (/\(\s/) {
666 err("whitespace after left paren");
667 }
668 # allow "for" statements to have empty "continue" clauses
669 if (/\s\)/ && !/^\s*for \([^;]*;[^;]*; \)/) {
670 err("whitespace before right paren");
671 }
672 if (/^\s*\(void\)[^ ]/) {
673 err("missing space after (void) cast");
674 }
675 if (/\S\{/ && !/\{\{/) {
676 err("missing space before left brace");
677 }
678 if ($in_function && /^\s+\{/ &&
679 ($prev =~ /\)\s*$/ || $prev =~ /\bstruct\s+\w+$/)) {
680 err("left brace starting a line");
681 }
682 if (/\}(else|while)/) {
683 err("missing space after right brace");
684 }
685 if (/\}\s\s+(else|while)/) {
686 err("extra space after right brace");
687 }
688 if (/\b_VOID\b|\bVOID\b|\bSTATIC\b/) {
689 err("obsolete use of VOID or STATIC");
690 }
691 if (/\b$typename\*/o) {
692 err("missing space between type name and *");
693 }
694 if (/^\s+#/) {
695 err("preprocessor statement not in column 1");
696 }
697 if (/^#\s/) {
698 err("blank after preprocessor #");
699 }
700 if (/!\s*(strcmp|strncmp|bcmp)\s*\(/) {
701 err("don't use boolean ! with comparison functions");
702 }
703
704 #
705 # We completely ignore, for purposes of indentation:
706 # * lines outside of functions
707 # * preprocessor lines
708 #
709 if ($check_continuation && $in_function && !$in_cpp) {
710 process_indent($_);
711 }
712 if ($picky) {
713 # try to detect spaces after casts, but allow (e.g.)
714 # "sizeof (int) + 1", "void (*funcptr)(int) = foo;", and
715 # "int foo(int) __NORETURN;"
716 if ((/^\($typename( \*+)?\)\s/o ||
717 /\W\($typename( \*+)?\)\s/o) &&
718 !/sizeof\s*\($typename( \*)?\)\s/o &&
719 !/\($typename( \*+)?\)\s+=[^=]/o) {
720 err("space after cast");
721 }
722 if (/\b$typename\s*\*\s/o &&
723 !/\b$typename\s*\*\s+const\b/o) {
724 err("unary * followed by space");
725 }
726 }
727 if ($check_posix_types) {
728 # try to detect old non-POSIX types.
729 # POSIX requires all non-standard typedefs to end in _t,
730 # but historically these have been used.
731 my $types = join '|', keys %old2posix;
732 if (/\b($types)\b/) {
733 err("non-POSIX typedef $1 used: use $old2posix{$1} instead");
734 }
735 }
736 if ($heuristic) {
737 # cannot check this everywhere due to "struct {\n...\n} foo;"
738 if ($in_function && !$in_declaration &&
739 /\}./ && !/\}\s+=/ && !/\{.*\}[;,]$/ && !/\}(\s|)*$/ &&
740 !/\} (else|while)/ && !/\}\}/) {
741 err("possible bad text following right brace");
742 }
743 # cannot check this because sub-blocks in
744 # the middle of code are ok
745 if ($in_function && /^\s+\{/) {
746 err("possible left brace starting a line");
747 }
748 }
749 if (/^\s*else\W/) {
750 if ($prev =~ /^\s*\}$/) {
751 err_prefix($prev,
752 "else and right brace should be on same line");
753 }
754 }
755 $prev = $line;
756 }
757
758 if ($prev eq "") {
759 err("last line in file is blank");
760 }
761
762 }
763
764 #
765 # Continuation-line checking
766 #
767 # The rest of this file contains the code for the continuation checking
768 # engine. It's a pretty simple state machine which tracks the expression
769 # depth (unmatched '('s and '['s).
770 #
771 # Keep in mind that the argument to process_indent() has already been heavily
772 # processed; all comments have been replaced by control-A, and the contents of
773 # strings and character constants have been elided.
774 #
775
776 my $cont_in; # currently inside of a continuation
777 my $cont_off; # skipping an initializer or definition
778 my $cont_noerr; # suppress cascading errors
779 my $cont_start; # the line being continued
780 my $cont_base; # the base indentation
781 my $cont_first; # this is the first line of a statement
782 my $cont_multiseg; # this continuation has multiple segments
783
784 my $cont_special; # this is a C statement (if, for, etc.)
785 my $cont_macro; # this is a macro
786 my $cont_case; # this is a multi-line case
787
788 my @cont_paren; # the stack of unmatched ( and [s we've seen
789
790 sub
791 reset_indent()
792 {
793 $cont_in = 0;
794 $cont_off = 0;
795 }
796
797 sub
798 delabel($)
799 {
800 #
801 # replace labels with tabs. Note that there may be multiple
802 # labels on a line.
803 #
804 local $_ = $_[0];
805
806 while (/^(\t*)( *(?:(?:\w+\s*)|(?:case\b[^:]*)): *)(.*)$/) {
807 my ($pre_tabs, $label, $rest) = ($1, $2, $3);
808 $_ = $pre_tabs;
809 while ($label =~ s/^([^\t]*)(\t+)//) {
810 $_ .= "\t" x (length($2) + length($1) / 8);
811 }
812 $_ .= ("\t" x (length($label) / 8)).$rest;
813 }
814
815 return ($_);
816 }
817
818 sub
819 process_indent($)
820 {
821 require strict;
822 local $_ = $_[0]; # preserve the global $_
823
824 s///g; # No comments
825 s/\s+$//; # Strip trailing whitespace
826
827 return if (/^$/); # skip empty lines
828
829 # regexps used below; keywords taking (), macros, and continued cases
830 my $special = '(?:(?:\}\s*)?else\s+)?(?:if|for|while|switch)\b';
831 my $macro = '[A-Z_][A-Z_0-9]*\(';
832 my $case = 'case\b[^:]*$';
833
834 # skip over enumerations, array definitions, initializers, etc.
835 if ($cont_off <= 0 && !/^\s*$special/ &&
836 (/(?:(?:\b(?:enum|struct|union)\s*[^\{]*)|(?:\s+=\s*))\{/ ||
837 (/^\s*\{/ && $prev =~ /=\s*(?:\/\*.*\*\/\s*)*$/))) {
838 $cont_in = 0;
839 $cont_off = tr/{/{/ - tr/}/}/;
840 return;
841 }
842 if ($cont_off) {
843 $cont_off += tr/{/{/ - tr/}/}/;
844 return;
845 }
846
847 if (!$cont_in) {
848 $cont_start = $line;
849
850 if (/^\t* /) {
851 err("non-continuation indented 4 spaces");
852 $cont_noerr = 1; # stop reporting
853 }
854 $_ = delabel($_); # replace labels with tabs
855
856 # check if the statement is complete
857 return if (/^\s*\}?$/);
858 return if (/^\s*\}?\s*else\s*\{?$/);
859 return if (/^\s*do\s*\{?$/);
860 return if (/\{$/);
861 return if (/\}[,;]?$/);
862
863 # Allow macros on their own lines
864 return if (/^\s*[A-Z_][A-Z_0-9]*$/);
865
866 # cases we don't deal with, generally non-kosher
867 if (/\{/) {
868 err("stuff after {");
869 return;
870 }
871
872 # Get the base line, and set up the state machine
873 /^(\t*)/;
874 $cont_base = $1;
875 $cont_in = 1;
876 @cont_paren = ();
877 $cont_first = 1;
878 $cont_multiseg = 0;
879
880 # certain things need special processing
881 $cont_special = /^\s*$special/? 1 : 0;
882 $cont_macro = /^\s*$macro/? 1 : 0;
883 $cont_case = /^\s*$case/? 1 : 0;
884 } else {
885 $cont_first = 0;
886
887 # Strings may be pulled back to an earlier (half-)tabstop
888 unless ($cont_noerr || /^$cont_base / ||
889 (/^\t*(?: )?(?:gettext\()?\"/ && !/^$cont_base\t/)) {
890 err_prefix($cont_start,
891 "continuation should be indented 4 spaces");
892 }
893 }
894
895 my $rest = $_; # keeps the remainder of the line
896
897 #
898 # The split matches 0 characters, so that each 'special' character
899 # is processed separately. Parens and brackets are pushed and
900 # popped off the @cont_paren stack. For normal processing, we wait
901 # until a ; or { terminates the statement. "special" processing
902 # (if/for/while/switch) is allowed to stop when the stack empties,
903 # as is macro processing. Case statements are terminated with a :
904 # and an empty paren stack.
905 #
906 foreach $_ (split /[^\(\)\[\]\{\}\;\:]*/) {
907 next if (length($_) == 0);
908
909 # rest contains the remainder of the line
910 my $rxp = "[^\Q$_\E]*\Q$_\E";
911 $rest =~ s/^$rxp//;
912
913 if (/\(/ || /\[/) {
914 push @cont_paren, $_;
915 } elsif (/\)/ || /\]/) {
916 my $cur = $_;
917 tr/\)\]/\(\[/;
918
919 my $old = (pop @cont_paren);
920 if (!defined($old)) {
921 err("unexpected '$cur'");
922 $cont_in = 0;
923 last;
924 } elsif ($old ne $_) {
925 err("'$cur' mismatched with '$old'");
926 $cont_in = 0;
927 last;
928 }
929
930 #
931 # If the stack is now empty, do special processing
932 # for if/for/while/switch and macro statements.
933 #
934 next if (@cont_paren != 0);
935 if ($cont_special) {
936 if ($rest =~ /^\s*\{?$/) {
937 $cont_in = 0;
938 last;
939 }
940 if ($rest =~ /^\s*;$/) {
941 err("empty if/for/while body ".
942 "not on its own line");
943 $cont_in = 0;
944 last;
945 }
946 if (!$cont_first && $cont_multiseg == 1) {
947 err_prefix($cont_start,
948 "multiple statements continued ".
949 "over multiple lines");
950 $cont_multiseg = 2;
951 } elsif ($cont_multiseg == 0) {
952 $cont_multiseg = 1;
953 }
954 # We've finished this section, start
955 # processing the next.
956 goto section_ended;
957 }
958 if ($cont_macro) {
959 if ($rest =~ /^$/) {
960 $cont_in = 0;
961 last;
962 }
963 }
964 } elsif (/\;/) {
965 if ($cont_case) {
966 err("unexpected ;");
967 } elsif (!$cont_special) {
968 err("unexpected ;") if (@cont_paren != 0);
969 if (!$cont_first && $cont_multiseg == 1) {
970 err_prefix($cont_start,
971 "multiple statements continued ".
972 "over multiple lines");
973 $cont_multiseg = 2;
974 } elsif ($cont_multiseg == 0) {
975 $cont_multiseg = 1;
976 }
977 if ($rest =~ /^$/) {
978 $cont_in = 0;
979 last;
980 }
981 if ($rest =~ /^\s*special/) {
982 err("if/for/while/switch not started ".
983 "on its own line");
984 }
985 goto section_ended;
986 }
987 } elsif (/\{/) {
988 err("{ while in parens/brackets") if (@cont_paren != 0);
989 err("stuff after {") if ($rest =~ /[^\s}]/);
990 $cont_in = 0;
991 last;
992 } elsif (/\}/) {
993 err("} while in parens/brackets") if (@cont_paren != 0);
994 if (!$cont_special && $rest !~ /^\s*(while|else)\b/) {
995 if ($rest =~ /^$/) {
996 err("unexpected }");
997 } else {
998 err("stuff after }");
999 }
1000 $cont_in = 0;
1001 last;
1002 }
1003 } elsif (/\:/ && $cont_case && @cont_paren == 0) {
1004 err("stuff after multi-line case") if ($rest !~ /$^/);
1005 $cont_in = 0;
1006 last;
1007 }
1008 next;
1009 section_ended:
1010 # End of a statement or if/while/for loop. Reset
1011 # cont_special and cont_macro based on the rest of the
1012 # line.
1013 $cont_special = ($rest =~ /^\s*$special/)? 1 : 0;
1014 $cont_macro = ($rest =~ /^\s*$macro/)? 1 : 0;
1015 $cont_case = 0;
1016 next;
1017 }
1018 $cont_noerr = 0 if (!$cont_in);
1019 }